CN100383866C - Multi-layer writable optical record carrier with an optimum power calibration area, and method and apparatus for forming optimum power calibration areas on such a record carrier - Google Patents

Multi-layer writable optical record carrier with an optimum power calibration area, and method and apparatus for forming optimum power calibration areas on such a record carrier Download PDF

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Publication number
CN100383866C
CN100383866C CNB2004800178615A CN200480017861A CN100383866C CN 100383866 C CN100383866 C CN 100383866C CN B2004800178615 A CNB2004800178615 A CN B2004800178615A CN 200480017861 A CN200480017861 A CN 200480017861A CN 100383866 C CN100383866 C CN 100383866C
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recording layer
optimum power
power calibration
layer
calibration area
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CN1813291A (en
Inventor
H·C·F·马坦斯
W·R·科佩斯
R·J·A·范登奥特拉亚尔
P·H·沃尔里
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00745—Sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24062—Reflective layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

A writable optical record carrier (100) comprising a plurality of recording layers LO,..., Ln-1 separated by a spacer material, each recording layer comprising an optimum power calibration area (101,111,121,131) having a first portion (102,112,122) with an average reflection value representative of a recorded layer and a second portion (113,123,133) with an average reflection value representative of an unrecorded layer, a method, and an apparatus for forming optimum power calibration areas on such a writable optical record carrier are presented. The optimum power calibration areas partially overlap such that the optimum power calibration areas of each pair of consecutive recording layers form a step, and the first portions of said plurality of recording layers have the form of a staircase. Each step formed by a pair of consecutive recording layers k, k+1 has a preferred minimum step size.

Description

The method and apparatus that has the multi-layer writable optical record carrier of optimum power calibration area and be used on this record carrier, forming optimum power calibration area
The present invention relates to a kind of writable optical record carrier, more particularly, relate to a kind of WORM of record or RW dish, it comprises that by the separated a plurality of recording layers of a kind of interval insulant each recording layer comprises optimum power calibration (OPC) district.The invention still further relates to a kind of method and apparatus that is used on this writable optical record carrier, forming optimum power calibration area.
Growing demand to data memory capacity has caused developing the high-density optical record medium, for example write-once or rewritable DVD dish and Blu-ray disc (BD).In these situations, the numerical aperture (NA) by increasing object lens and by reducing record/read Wavelength of Laser makes data capacity be improved.
A kind of additional project that is used to obtain high storage capacity is the quantity that increases recording layer.For example, by introducing n information storage layer, can make data capacity improve n doubly.For DVD+R, DVD+RW, BD-R and BD-RW medium, a current back scheme of continuing to use just.It is known that twice increases (in dual layer discs), and four times of increases (in four layers of dish) are in conceptual phase.
The present known principle that writes that two kinds of main differences are arranged: (for example at write-once medium, CD-R, DVD+R and DVD-R) situation under be the dyestuff record, under the situation of rewritable media (for example CD-RW, DVD-RAM, DVD-RW, DVD+RW and BD-RW), be phase-change recording.
Phase change recording layers generally includes a kind of phase-change material, and it is typically and is clipped in two alloys with lasting polycrystalline structure in the lamination between the dielectric ZnS-SiO2 layer.The energy that writes laser beam with its irradiation record carrier by the tracer signal modulation will farthest be absorbed by phase-change material, cause the phase transformation from the crystalline phase to the amorphous phase thus.And crystalline phase (ground state) has higher reflectivity, and amorphous phase (write state) has the reflectivity that reduces.Therefore, depend on and read that light beam impinges upon write area (mark) or not on the write area (ridge) that recording layer focuses on the light beam that reads on the described recording stack with different intensity reflection.
Dye recording layer typically is made of organic dye layer that comprises dye materials (similar, for example ultramarine, phthalocyanine or metallized azo thing) and reflective metal layer, and described reflective metal layer typically is made of gold, silver or aluminium.Write laser beam and will be recorded layer segment ground and absorb, thereby bleach lastingly and irreversibly and decompose dye materials.The light beam that reads that shines on the mark that writes in such mode will be by that mark part ground scattering.Therefore, depend on that in intensity of light reflected on the reflective metal layer reading light beam shines on the mark or the almost interference-free recording layer that passes through.
Like this, the recording status of layer comprises the variation of this layer average reflection, and influences its transmission.Under the situation of multilayer disc, this means on an appointment ((in-focus) in focus) layer, carry out read and write the influence that has other (focus alignment (out-of-focus)) layer in generally being coiled.In the NA of object lens scope, then according to the situation that exists in the out-of-focus layer of mark (representative data) in that zone, the parasitic light and their average reflection that produce at the out-of-focus layer place are proportional.In addition, exist data can cause the transmission property difference of those layers in the out-of-focus layer.Therefore, when laser beam by one or more layers time, the optical power that is received by in-focus layer is changed, and whether comprises data according to peripheral layer in the NA of object lens scope and can obtain different top condition (that is, Writing power, focal shift etc.).
In order to obtain the record data of best quality on CD, driver was carried out optimum power calibration procedure (OPC) before recording processing as everyone knows.By this OPC process, driver is identified for the best power of record data.Usually, no matter when will coil (empty or partial record) is inserted into and all carries out this OPC process in the driver.For multiplayer optical disk, the possibility of result that carries out the OPC process for one deck depends on whether have data in other layer.
Record data for fear of obtain the difference quality in multiplayer optical disk then must solve these influences.In european patent application 1244096, a kind of dish that each recording layer of a plurality of recording layers all has the opc test district that has has been proposed.These opc test districts comprise the part with best power bang path and have the part of lowest power bang path.Yet, in this dish, very big by the space that these opc test districts occupy.
The purpose of this invention is to provide a kind of compact disc rocordable with a plurality of recording layers, wherein be equipped with optimum power calibration area, its calibration for the optimum write power that is used for optimum write-in policy is effectively, therefore requires minimum space.Another purpose provides a kind of method and apparatus that is used for forming optimum power calibration area on this writable optical record carrier.
According to a first aspect of the invention, this purpose is by being that the compact disc rocordable that uses in the pen recorder of object lens of NA is realized having the aperture, described dish comprises a plurality of recording layer L0 that at every turn separated by interval insulant, ..., Ln-1, each recording layer comprises optimum power calibration area, wherein at least the layer L0 ..., Ln-2, or L1, ..., the optimum power calibration area of Ln-1 has first, and it has represents the average reflection value of recording layer, each recording layer L0, ..., the optimum power calibration area of Ln-1 has second portion, and it has represents the not average reflection value of recording layer, and described optimum power calibration area is partly overlapping to make every couple of recording layer Lk in succession, the first of Lk+1 forms a step, its minimum step dimension w K, k+1For:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 , - - - ( 1 )
Wherein ε represents the maximum radius deviation (misalignment) of each recording layer, Δ K, k+1Represent the thickness of the interval insulant between successive layer Lk and the Lk+1, n mBe the refraction coefficient of interval insulant, and the first of wherein said a plurality of recording layers has the form of ladder.
The present invention has considered: in the write-once multilayered medium, preferably record will successively carry out.This write sequence also can be applicable in the recordable multi-layer disc.For the most rational implementation of record successively is from the top to the bottom or from bottom to top.By the definition step shape part, can in the OPC process, imitate data influence that is arranged in higher layer (higher-lying layer) and the data disappearance that is arranged in lower layer, vice versa.Its advantage is, each (during the OPC with during the user data record) can run into all during the test of successive layers and record that higher with lower layer reflects and/or the identical situation of transmission from being positioned at, therefore on dish, occupy minimum space.
The preferred sequence that will write down according to each layer, the width of selecting step in the ladder is so that guarantee in the OPC process, about incident beam from the parasitic light that is positioned at higher layer always from the part of representing posting field, and from the parasitic light that is positioned at lower layer always from representing the not part of recording areas, perhaps vice versa.
According to a second aspect of the invention, it constitutes further developing of first aspect, and described optimum power calibration area is positioned adjacent to the center of described dish, and described first forms concentric circles.
According to a third aspect of the invention we, it constitutes further developing of first aspect, and described optimum power calibration area is positioned adjacent to the periphery of described dish, and described first forms concentric circles.
According to a forth aspect of the invention, it constitutes second or the further developing of the third aspect, and watches in the direction away from the light beam light incident side of described dish, and described concentrically ringed radius reduces from the recording layer to the recording layer.
According to a fifth aspect of the invention, it constitutes second or the further developing of the third aspect, and watches in the direction away from the light beam light incident side of described dish, and described concentrically ringed radius increases from the recording layer to the recording layer.
In addition, according to a sixth aspect of the invention, above-mentioned purpose of the present invention is to realize by a kind of method that forms optimum power calibration area on compact disc rocordable, described indicator comprises a plurality of recording layer L0 that at every turn separated by interval insulant, ..., Ln-1, be that the once recording device of the object lens of NA writes mark on described recording layer wherein by having the aperture, on each recording layer, form optimum power calibration area thus, the feasible L0 of layer at least ..., Ln-2, or L1, ..., the optimum power calibration area of Ln-1 has first, and it has represents the average reflection value of recording layer, each recording layer L0, ..., the optimum power calibration area of Ln-1 has second portion, and it has represents the not average reflection value of recording layer, and described optimum power calibration area is partly overlapping to make every couple of recording layer Lk in succession, the first of Lk+1 forms a step, and its minimum step dimension is:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 ,
Wherein ε represents the maximum radius deviation of each recording layer, Δ K, k+1Represent the thickness of the interval insulant between successive layer Lk and the Lk+1, n mBe the refraction coefficient of interval insulant, and the first of wherein said a plurality of recording layers has the form of ladder.
According to a seventh aspect of the invention, it constitutes further developing of the 6th aspect, and the center of close described dish writes described optimum power calibration area, and described first forms concentric circles.
According to an eighth aspect of the invention, it constitutes further developing of the 6th aspect, and the periphery of close described dish writes described optimum power calibration area, and described first forms concentric circles.
According to a ninth aspect of the invention, it constitutes the 7th or the further developing of eight aspect, and writes described optimum power calibration area and make and watch in the direction away from the light beam light incident side of described dish that described concentrically ringed radius reduces from the recording layer to the recording layer.
According to the tenth aspect of the invention, it constitutes the 7th or the further developing of eight aspect, write described optimum power calibration area in such a way and make and watch that described concentrically ringed radius increases from the recording layer to the recording layer in direction away from the light beam light incident side of described dish.
In addition, according to an eleventh aspect of the invention, above-mentioned purpose is to realize at the equipment of compact disc rocordable identifying recording layer by being arranged for, described dish comprises a plurality of recording layer L0, ..., Ln-1, they have maximum radius deviation ε, and by the thickness deltat that has between per two successive layers Lk, Lk+1 K, k+1And has a refraction coefficient n mInterval insulant separate, described equipment comprises: have the writing unit that the aperture is the object lens of NA, the said write unit is arranged for writing mark on described recording layer; Control module, it is arranged for controlling the said write unit, make and write mark in the pre-position of described recording layer, on each recording layer, form optimum power calibration area thus, wherein at least the layer L0, ..., Ln-2, or L1, ..., the optimum power calibration area of Ln-1 has first, and it has represents the average reflection value of recording layer, each recording layer L0, ..., the optimum power calibration area of Ln-1 has second portion, and it has represents the not average reflection value of recording layer, and described optimum power calibration area is partly overlapping to make every couple of recording layer Lk in succession, the first of Lk+1 forms a step, and its minimum step dimension is:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 ,
And the first of wherein said a plurality of recording layers has the form of ladder.
Can be in the record carrier thickness deltat of the interval insulant between the storage and the maximum radius deviation ε of each recording layer, two successive layers Lk, the Lk+1 on one's body originally K, k+1Refraction coefficient n with interval insulant mCorresponding information.For example, under maybe can rewriteeing the situation of CD or DVD, standard WORM the part of information can be stored as modulated wobble signal in the prefabricated groove of dish.Selectively, can with information stores the data of (in advance) record at the importing track on the dish or other place.
In this case, according to a twelfth aspect of the invention, it constitutes the tenth further developing on the one hand, described equipment also comprise be used for from described compact disc rocordable obtain and the maximum radius deviation ε of each recording layer, two successive layers Lk, Lk+1 between the thickness deltat of interval insulant K, k+1Refraction coefficient n with interval insulant mThe device of corresponding information.
According to a thirteenth aspect of the invention, it constitutes further developing of the tenth one side, described control module further is arranged for storage and the corresponding information of maximum quantity that is recorded in the track in the second portion of any one deck during the OPC process, and also is used for writing on other layer the track of the second portion record equal number in the OPC zone that mark makes at all layers in addition.
Above and other objects of the present invention, feature and advantage will become apparent by following description of a preferred embodiment in conjunction with the accompanying drawings, wherein:
The schematic cross-section of Fig. 1 for having the multilayer disc in stepped appearance OPC zone in OPC operating period;
The schematic cross-section of Fig. 2 under a different conditions, having the multilayer disc in stepped appearance OPC zone in OPC operating period;
Fig. 3 is the schematic plan view of the maximum deviation of two recording layers in the multilayer disc;
Fig. 4 is the sectional pattern with multilayer disc of n recording layer, and it shows ground floor L0 and final layer Ln-1; With
Fig. 5 is the sectional pattern with multilayer disc of n recording layer, and it shows a pair of successive layers Li and Li-1.
Fig. 1 represents the sectional view according to first embodiment of writable optical record carrier of the present invention.Described writable optical record carrier is the multilayer disc 100 that comprises four recording layer L0 to L3 in this case, and wherein with respect to incident beam, L0 is ground floor or outermost layer, and L3 is a bottommost layer.In other words, L0 has defined the light beam light incident side of dish.Every layer of L0 to L3 comprises an OPC district 101,111,121 and 131 respectively.Except the OPC district of bottommost layer L3, each OPC district all has first 102,112 and 122 respectively, and it has represents the not average reflection value of recording layer.In addition, each recording layer L0 to L3 comprise be used for storage control data or user data do not write data field 104,114,124,134.Figure 1 illustrates the opc test laser beam 106 that enters dish from described light incident side.Arrow 105,115,125 is illustrated in the parasitic light of first's place reflection in the OPC district of out-of-focus layer L0 to L2, and light beam 106 focuses on the bottommost layer L3.In this case, provide first just enough only for layer L0, L1, L2 layer.Yet, the first with average reflection value of representing recording layer is provided also can for layer L3.
Fig. 2 represents the identical embodiment of 4 layers of dish 200.Opc test laser beam 206 is focused on the second layer L1 of dish 200 in this case, and arrow 205,225,235 is illustrated in the light of out-of-focus layer L0, L2 and the reflection of L3 place.More accurately, light reflects at second (not writing) part, 223,233 places in the OPC zone of first (writing) part 212 in the OPC zone of L0 and L2 and L3 respectively.
Can both find out that from Fig. 1 and 2 the OPC district is configured to overlap, so that make every pair of step of first formation in the OPC district of recording layer in succession, and the OPC district of described a plurality of recording layers has the form of ladder.Because its shape, these zones also are called staircase areas.
The direction of staircase areas is by the order that each layer write down (from the top to the bottom or from bottom to top) definition.In the embodiment shown in Fig. 1 and 2, the order of record is from the top to the bottom (L0 is to L3).If the reverse order (from bottom to top) of record is preferred, it just will be enough first being provided then only for layer L1, L2, L3.
Generally, carried out the OPC process by the general optic disc register before the recording processing of reality, because for example during the real time record film, layer jumps, and to need to carry out new OPC process be unacceptable, and it will cause the loss of part film.Therefore, the OPC zone should just exist before the OPC process begins.For example when being installed in " blank " dish on the register first, can produce described OPC zone by writing suitable mark by register itself, perhaps they are write down (ROM) on ready-made dish in advance.In the former situation, control module can be provided in register, it is arranged for detecting at register carried out OPC zone ablation process when not having the OPC zone to exist before the OPC process begins.Therefore, for example will can be stored in the table or storer of register by " the pseudo-data " that writing unit writes.Described control module can further be arranged for controlling writing unit to produce the light beam that writes according to the pseudo-data-modulated of being stored.Then, write mark in the pre-position of layer on (in the example shown in Fig. 1 and 2, only on layer L0, L1, the L2) of dish, form the first of optimum power calibration area thus on each of these layers, it has the average reflection value of representing recording layer.
Note, the quality of data in the OPC zone that write by register or record in advance is unimportant, as long as it can produce the average reflection value of representing recording layer, the reflectivity that does not for example write the initial state layer is 75%, is 25% and write (bleaching or amorphous) regional reflectivity.
Below, we consider the inner radius R near dish MinThe OPC district at (center) and carry out situation about from the top to the bottom, writing down with respect to the laser light incident side of dish.The present invention also can be applicable to the bottom to the top record.In addition, following argumentation can extend to any other radius in direct mode, preferably extends to the external diameter R near dish MaxThe OPC zone of (periphery).
In order to ensure during the OPC with during user data record, run into identical situation (by/by above and the reflection/transmission of following surface layer), next to determine the minimum step width.Two kinds of influences have been considered: the drift angle of the cone-shaped beam of deviation of each layer or excentricity and incoming laser beam.
Incident is read or is write light beam and focused on by the object lens of the read/write unit of register.This just produces a cone-shaped beam that has by the vertex angle theta of the numerical aperture NA of object lens definition.It is:
NA＝n m×sin(Θ)， (2)
N wherein mBe the refraction coefficient by the medium of its propagation, described medium for example is with the separated interval insulant of recording layer.
On the out-of-focus layer that is positioned at the distance, delta place, the spot radius R of generation is:
R = Δ × sin 2 ( Θ ) 1 - sin 2 ( Θ ) = Δ × NA n m 2 - N A 2 - - - ( 3 )
Determine the minimum widith of staircase areas so that guarantee that the opc test light beam is always by having the higher layer (write down to the bottom at the top) that is positioned at of the average reflection of representing recording layer by this radius R.
Till now, also do not consider the situation of the possible deviation of each layer.Layer in the multilayer disc should be about a reference point, for example ideal geometrical center of Pan gravity alignment.With respect to this reference point, the tolerance of each layer location, in other words the eccentric throw of the pre-groove spiral of each layer is ε.This means that any layer in the multilayer disc is to relative to each other all almost skew+2 ε or-2 ε, referring to Fig. 3.Show the inner radial R in the OPC zone of two typical layers Min302 and 312.Their center 304,314 skew+2 ε (to the right) or-2 ε (left).For the deviation or the excentricity of proofreading and correct maximum possible,, as follows with extra 2 ε of increasing of width that consider the staircase areas of successive layers.
The starting position in the OPC district on the bottommost layer Ln-1 of the dish of N lamination is defined as R OPC, Ln- 1When Ln-1 was in focus, ground floor L0 went up the width w with respect to the luminous point of incident light Ln-1, L0The equation that can provide from above (3) calculates.Cone-shaped beam 406 is all caught by the first 402 that writes among the L0 when guaranteeing that not writing on the second portion 433 in Ln-1 carried out OPC, and the second portion in the OPC zone among the Ln-1 should start from:
R min , Ln - 1 + 2 ϵ + Δ tot × NA n m 2 - NA 2 , - - - ( 4 )
Δ wherein TotFor the total vertical range between Ln-1 and the L0 (all at interval thickness and), referring to Fig. 4.
In addition, in order to guarantee that not writing on the second portion 523 in Lk+1 focuses on the light beam on layer Lk+1 when carrying out OPC light cone 506 all should be by 502, two successive layers Lk of the first of record among the next higher level Lk and the step size between the Lk+1:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 , - - - ( 5 )
Δ wherein K, k+1For the spacer thickness between successive layer, referring to Fig. 5.Note the Δ between the different layers K, k+1Can change.
These considerations mean in n layer dish, all should observe following equation for the minimum widith wi of the first in the OPC district of every layer of Li (i=0......n-1):
w i = 2 ϵ + NA n m 2 - NA 2 · Σ k = 0 n - 2 Δ k , k + 1
+ ( 1 - δ i , n - 1 ) · Σ k = i n - 2 [ 2 ϵ + NA n m 2 - NA 2 · Δ k , k + 1 ] - - - ( 6 )
Wherein, Δ K, k+1Be the spacer thickness between layer k+1 and the k.Notice that first sum term is equivalent to the total spacer thickness Δ between Ln-1 and the L0 Tot, and because Kronecker dalta function δ I, n-1, for i=n-1, last sum term will go to zero.Notice that bottommost layer Ln-1 does not need to have and the first of the corresponding average reflection value of recording layer, will be to its darker layer that focuses on because do not have.Therefore, also can be with w N-1Be made as zero.In addition, ground floor L0 does not need to have and the second portion of the corresponding average reflection value of recording layer not, can carry out the OPC process in the user data area of ground floor because if need yet.Therefore, the breadth extreme in OPC district can be restricted to w 0
By remove the track quantity in the first in OPC district that ladder width obtains to comprise (puppet) data with orbit interval.
The second portion in OPC district, the place that the OPC process promptly takes place in layer always is defined as contiguous its first.This guarantees for many OPC process of carrying out on the single-deck, is arranged in the requirement that out-of-focus layer needs data (not having data) higher (lower) and is satisfied, especially when each OPC on every layer uses the track of equal number.The total length available for the OPC district can require to be provided with by other.
When test data new in the OPC process was written in the second portion in OPC district of arbitrary floor, the condition of minimum step size may no longer be satisfied.Therefore, in another embodiment of the present invention, the equipment that is used to write down be arranged for (temporarily) storage with during the OPC process on this layer the corresponding information of maximum quantity of track (or data block) of record.In addition, it is arranged for, and record causes representing the data or the mark of the average reflection value of recording layer on other layer, makes the track (data block) of equal number be recorded in the second portion in the OPC district on all floor.
For example, at NA=0.65, n m=1.55, Δ=50 μ m, 2 ε=70 μ m and according to equation (6) OPC district in the DVD-dual layer+R of internal diameter of dish, first's internal diameter that we obtain the second portion in the OPC district among following result: the L1 (bottommost layer) starts from from R Min, L1The following width that the beginning (internal diameter) of the L1 track at place has calculated:
W1=70+0.46*50=93 μ m=126 track
For L0 (ground floor), the width of the first in OPC district is from R Min, L0The beginning of the L0 track at place calculates:
W0=70+0.46*50+70+0.46*50=186 μ m=251 track
The second portion in the OPC district among the L0 is closelyed follow at w 0The back begins.
At NA=0.65, n m=1.55, among four layers of DVD+R of Δ=50 μ m, 2 ε=70 μ m, according to equation (6), to the OPC district on the internal diameter of dish, we obtain following result:
w 3=70+0.46*150=139 μ m=282 track
w 2=70+0.46*150+70+0.46*50=232 μ m=314 track
w 1=70+0.46*150+70+0.46*50+70+0.46*50=325 μ m=439 track and
w 0=70+0.46*150+70+0.46*50+70+0.46*50+70+0.46*50=418 μ m=565 track.
Each width w iAll be from R Min, LiThe beginning (internal diameter) of the corresponding track at place begins to calculate.
The second portion in OPC district starts from its first continuous once more.
In all the other embodiment same as described above except the OPC district is on the external diameter of dish, for w iWe can obtain having the result of same absolute, but have negative sign.Therefore, each width w iAll be from R Max, LiThe end (external diameter) of the corresponding track at place begins to calculate.In this case, preferably should carry out OPC towards internal diameter from external diameter.
In one embodiment of the invention, the result who writes in staircase areas comprises control information.
Should notice that the present invention is not limited to comprise 2 or 4 layers optical record carrier, but also can be applicable to comprise 3,5 or more multi-layered record carrier.Also be not restricted to internal diameter or external diameter OPC district in addition, but also can be applied to the set-up mode in any other OPC district.

Claims (13)

1. be the compact disc rocordable that uses in the pen recorder of object lens of NA having the aperture, described compact disc rocordable comprises that the number of at every turn being separated by interval insulant is a plurality of recording layer L0 of n, ..., Ln-1, each recording layer comprises optimum power calibration area, it is characterized in that layer L0 at least, ..., Ln-2 or layer L1, ..., the optimum power calibration area of Ln-1 has first, it has represents the average reflection value of recording layer, and each described recording layer L0 ..., the optimum power calibration area of Ln-1 has second portion, it has represents the not average reflection value of recording layer, and described optimum power calibration area is partly overlapping to make the first of the described optimum power calibration area in described a plurality of recording layer have the form of ladder, wherein every couple of recording layer Lk in succession, the first of Lk+1 forms a step, its minimum step dimension W K, k+1For:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 ,
Wherein ε represents the maximum radius deviation of each recording layer, Δ K, k+1Represent successive layer Lk, the thickness of the interval insulant between the Lk+1, n mRefraction coefficient for interval insulant.
2. compact disc rocordable according to claim 1 is characterized in that described optimum power calibration area is positioned adjacent to the center of described dish, and described first forms concentric circles.
3. compact disc rocordable according to claim 1 is characterized in that described optimum power calibration area is positioned adjacent to the periphery of described dish, and described first forms concentric circles.
4. according to claim 2 or 3 described compact disc rocordables, it is characterized in that watching at the light beam light incident side away from described dish, described concentrically ringed radius reduces from the recording layer to the recording layer.
5. according to claim 2 or 3 described compact disc rocordables, it is characterized in that watching at the light beam light incident side away from described dish, described concentrically ringed radius increases from the recording layer to the recording layer.
6. on compact disc rocordable, form the method for optimum power calibration area, described dish comprises that the number of being separated by interval insulant is a plurality of recording layer L0 of n, ..., Ln-1, be that the once recording device of the object lens of NA writes mark on described recording layer wherein by having the aperture, on each recording layer, form optimum power calibration area thus, the feasible L0 of layer at least, ..., Ln-2 or layer L1, ..., the optimum power calibration area of Ln-1 has first, and it has represents the average reflection value of recording layer and each recording layer L0, ..., the optimum power calibration area of Ln-1 has second portion, and it has represents the not average reflection value of recording layer, and the partly overlapping first of the described optimum power calibration area in described a plurality of recording layer that makes of described optimum power calibration area has the form of ladder, every couple of recording layer Lk in succession wherein, the first of Lk+1 forms a step, and its minimum step dimension is:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 ,
Wherein ε represents the maximum radius deviation of each recording layer, Δ K, k+1Represent successive layer Lk, the thickness of the interval insulant between the Lk+1, n mRefraction coefficient for interval insulant.
7. method according to claim 6 is characterized in that writing described optimum power calibration area near the center of described dish, and described first forms concentric circles.
8. method according to claim 6 is characterized in that writing described optimum power calibration area near the periphery of described dish, and described first forms concentric circles.
9. according to claim 7 or 8 described methods, it is characterized in that writing described optimum power calibration area and make and watch that described concentrically ringed radius reduces from the recording layer to the recording layer at light beam light incident side away from described dish.
10. according to claim 7 or 8 described methods, it is characterized in that writing described optimum power calibration area and make and watch that described concentrically ringed radius increases from the recording layer to the recording layer at light beam light incident side away from described dish.
11. be arranged for the equipment at the compact disc rocordable identifying recording layer, described dish comprises that number is a plurality of recording layer L0 of n ..., Ln-1, they have maximum radius deviation ε, and by the thickness deltat that has between per two successive layer Lk, Lk+1 K, k+1And has a refraction coefficient n mInterval insulant separate, described equipment comprises:
Have the writing unit that the aperture is the object lens of NA, the said write unit is arranged for writing mark on described recording layer;
Control module, it is arranged for controlling the said write unit, make and write mark in the pre-position of described recording layer, on each recording layer, form optimum power calibration area thus, wherein at least the layer L0, ..., Ln-2 or layer L1, ..., the optimum power calibration area of Ln-1 has first, and it has represents the average reflection value of recording layer and each recording layer L0, ..., the optimum power calibration area of Ln-1 has second portion, and it has represents the not average reflection value of recording layer, and the partly overlapping first of the described optimum power calibration area in described a plurality of recording layer that makes of described optimum power calibration area has the form of ladder, every couple of recording layer Lk in succession wherein, the first of Lk+1 forms a step, and its minimum step dimension is:
w k , k + 1 = 2 ϵ + NA n m 2 - N A 2 · Δ k , k + 1 ,
12. equipment according to claim 11 is characterized in that described equipment also comprises:
Be used for from described compact disc rocordable obtain and the maximum radius deviation ε of each recording layer, two successive layers Lk, Lk+1 between the thickness deltat of interval insulant K, k+1Refraction coefficient n with interval insulant mThe device of corresponding information.
13. equipment according to claim 11, it is characterized in that described control module further is arranged for storage and the corresponding information of maximum quantity that is recorded in the track in the second portion of any one deck during optimum power calibration procedure, and also be used for writing mark in addition and make the track of record equal number in the second portion at the optimum power calibration area of all layers at other layer.
CNB2004800178615A 2003-06-26 2004-06-18 Multi-layer writable optical record carrier with an optimum power calibration area, and method and apparatus for forming optimum power calibration areas on such a record carrier Expired - Fee Related CN100383866C (en)

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